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tunde-olaoye avatar image

Off Grid Installation AC Coupled Fronius Disconnects with Back Up Generator Is Switched On

Hello


I have installed Quattro 8kva with 8kW Fronius AC coupled with a CCGX 800Ah of batteries. It is an off grid installation with PV inverter assistant on. When I switch on my generator and the Quattro synchronises with it the Fronius inverter disconnects and says error code 107 which meant no grid.

My generator is 4.5kVa but the wave form is poor so I have limited the current to 13amps and I have used the Weak Ac function

From what I have read about the off grid systems in victron literatureI thought that the Quattro would control wave form so the Fronius and Generator could both power the loads and charge the generator.

But from reading other posts it seems the Quattro is just passing the generator AC frequency through and it’s too messy for the fronius to sync.


Is there a way to allow my generator and fronius to work?

Generatorcharging batteryAC PV Coupling
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3 Answers
Guy Stewart (Victron Community Manager) avatar image

Be careful what you wish for @tunde-olaoye,

Generally I do NOT recommend running a generator and AC PV inverter at the same time on an off grid system because of the potential for a surplus power spike (eg from a large load turning off) to feedback power INTO the generator.

It is not predictable how the generator will handle this potential, and it can cause damage.

I have written more about this in these answers:

https://community.victronenergy.com/questions/715/froniuscolour-gxquattro-byd-generator.html

https://community.victronenergy.com/questions/9095/could-a-quattro-backfeed-ac-to-generator.html

https://community.victronenergy.com/questions/28727/reverse-power-to-generator-in-ac-coupled-off-grid.html

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iRomeo avatar image

Have you set your Fronius to MG50? Maybe that is the issue here...

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Rob Fijn avatar image

Hello Tunde-olaoye,

In your case I would have the VEconfig running on my laptop connected to the Quattro with the MK2 or MK3 and then see the live numbers. You can see the frequency that the Quattro measures.

My experience with the Quattro is that is just passes the frequency from the generator to the output, same as with the voltage.

best regards,

Rob


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